Carrd - Simple, responsive one-page site creator.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Cargo - Cargo Collective is a web publishing platform that creates and offers accessible tools online.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Responsivize - A must-have tool to develop responsive websites
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.